what are the difficulties that i faced in chapter 2.1

Actually , after my brain got better(which has not recovered fully should be in another 1 week) , i found the topics relatively easier to understand and to do. Especially for chap 2.1 some parts of it were similar to what it did in sec 1. i sure hope that all my upcoming topics would be as easy as this but i know that it is almost impossible.-impossible is nothing ~ Adidas